import { IWalkHandlers } from './types';
declare class PackageWalker {
    private _onEnd;
    private _onError;
    private _onResolve;
    private _onUnresolve;
    private _onVisit;
    private _resolveDevDependency;
    constructor(walkHandlers: IWalkHandlers, resolveDevDependency: boolean);
    /**
     * Starts walk. You don't need to call this method directly.
     * [[walkPackageGraph]] calls this method instead.
     * @param root A start path (a project root usually)
     */
    start(root: string): void;
    private _handleError;
    private _linkFamilyTree;
    private _readPackage;
    private _resolve;
    private _visit;
    private _visitNodeModules;
    private _visitScopedPackages;
}
export default PackageWalker;
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